A row of tomatoes, beans and lettuces takes up space. In a small urban garden, it is tempting to assume that food crops leave less room for spontaneous flowers, insects or birds. A French study highlighted by the European Commission on 7 September 2026 offers a more nuanced picture: in the gardens examined, vegetable growing did not automatically conflict with biodiversity. Several signs of synergy emerged instead.

This does not mean that every vegetable patch becomes a wildlife refuge by itself. The research suggests that growing food is often part of a wider relationship with the garden. People who grew vegetables tended to plant more, spend more time outside and place greater value on wild species. What happens to biodiversity then depends on how the garden is managed.

What did the urban vegetable garden study examine?

Researchers Blanche Collard, Quentin Dutertre and Emmanuelle Baudry combined two complementary surveys. The first used a stratified nationwide sample of 795 people with gardens in France. The second focused on 31 domestic gardens in three neighbouring towns in the Yvette Valley, on the suburban edge of Paris.

For the local study, the scientists did more than ask residents about their habits. They measured the share of each garden occupied by flowerbeds, lawn, vegetable plots and non-vegetated surfaces. They also recorded deliberately planted and spontaneous flowering plants in April and May 2023. This design connects gardeners’ perceptions with ecological observations.

In the national survey, 67% of respondents reported having a vegetable garden. For 19% of all respondents, it covered at least a quarter of the garden. The vegetable plots in the Paris-area sample were much smaller, occupying between 0 and 10% of each property. The two parts of the study therefore describe different settings, which helps reveal whether patterns recur at more than one scale.

Are vegetable gardens and biodiversity compatible?

The data showed no clear opposition between valuing vegetable production and valuing wild plants and animals. In the national panel, the two priorities were positively associated. Vegetable growers also reported a stronger connection to nature and greater commitment to their gardens.

They planted more frequently too. In the Yvette Valley gardens, researchers recorded greater ornamental flower richness where vegetables were grown. A broader range of flowering plants may provide resources at different times of year, including pollen and nectar for insects.

The key word is “association”. The study does not prove that adding a vegetable patch causes biodiversity to rise or changes a person’s attitudes. People who are already interested in living things may simply be more likely to grow vegetables. Both processes could reinforce each other, but this research design cannot separate them.

Why might growing food deepen contact with nature?

A vegetable garden demands observation. Gardeners watch seedlings emerge, ask why leaves are turning yellow, notice flowers before fruit, check soil moisture and identify the insects nearby. Repeated attention makes relationships visible that are easy to miss in a uniform lawn.

Gardeners also encounter contradictions. A caterpillar may damage a cabbage before becoming a butterfly. A spontaneous plant may compete with a seedling yet flower when other resources are scarce. A pile of leaves may look untidy while providing shelter. Vegetable growing does not remove these tensions; it gives people a reason to understand them and decide when intervention is necessary.

The authors describe these contacts as experiences of nature. Planting, waiting, observing and trying again create direct encounters with seasons and other species. The survey suggests that this engagement reaches beyond the vegetable beds: participants with vegetable plots in the small Paris-area sample also reported spending more time in the rest of their gardens.

What can the study not tell us?

Ecological monitoring of 31 gardens is informative, but it is not a portrait of every French city. The Yvette Valley has its own climate, soils, urban form and gardening culture. A balcony, a heavily paved courtyard, a Mediterranean garden or a property in northern France may produce different results.

The local inventory covered flowering plants. It did not directly measure the diversity of wild bees, butterflies, birds, earthworms or soil microorganisms. More flowers may create more resources, but wildlife monitoring would be needed to identify the beneficiaries and determine how long any effects last.

Not every practice associated with vegetable gardening points in the same direction. Growers planted and mulched more often, but they also fertilised more frequently. Heavy fertilisation can favour a few vigorous plants at the expense of spontaneous flora. The outcome therefore depends on products, quantities, soil disturbance, watering, mowing and the amount of shelter retained.

How can a vegetable garden support biodiversity?

The first step is to connect food crops with the rest of the garden. A spotless vegetable patch surrounded by bare soil and separated from other vegetation offers fewer habitats than a mosaic of crops, flowers, shrubs, longer grass and small refuges. France’s Office for Biodiversity recommends plant diversity and continuity between these spaces.

Several practical principles turn that advice into manageable action:

  • Spread flowering across the seasons. Locally appropriate plants flowering from spring to autumn extend access to pollen and nectar. Herbs allowed to bloom can complement ornamental beds.
  • Keep a small spontaneous area. The whole garden does not need to become wild. A less frequently mown edge, dry stems or leaves beneath a hedge can diversify shelter.
  • Cover soil with natural materials. Mulch reduces evaporation and weeding while avoiding bare ground. It should suit the crop and not be piled against plant crowns.
  • Disturb soil selectively. Shallow, targeted work disrupts soil organisms less than frequent deep digging.
  • Avoid chemical pesticides. The French Office for Biodiversity notes that these products also affect non-target organisms. Observation, plant diversity, physical barriers and authorised biological control provide more targeted responses.
  • Create simple refuges. Wood, stones, hollow stems and a mixed hedge are often more useful than a decorative structure that is poorly placed or rarely maintained.

There is no universal planting list. A species recommended in one region may struggle elsewhere, and some ornamental plants can become invasive. Local origin, soil conditions and water availability matter as much as a “pollinator-friendly” label.

Must gardeners choose between harvests and wild plants?

The real trade-off is not simply a matter of square metres. A small productive bed can coexist with flowering edges, climbing crops, a hedge and a lightly managed corner. Conversely, a large, uniform, heavily fertilised vegetable plot with no shelter may offer little diversity.

It is sensible to start small: observe existing flowers, record visitors, mow one section less often, let some herbs flower and add one locally suitable species. These changes are easier to evaluate than a complete redesign. They reveal what works under the garden’s actual conditions and uses.

The research encourages us to move beyond a false opposition. Producing some food and welcoming wild species are not necessarily separate projects. They can support each other, provided that the pursuit of yield does not remove everything that was not deliberately planted.

What role can gardens play in urban biodiversity?

A domestic garden is small, but it is not isolated. Gardens lining a street or connected to a park, hedge, vacant lot or stream can provide stepping stones for species. Their value therefore depends partly on the surrounding neighbourhood and the continuity of vegetation.

Local authorities can support this network by protecting soil, reducing unnecessary night lighting, supplying locally sourced plants, backing community gardens and explaining less intensive management. Residents contribute detailed knowledge of their own plots and can document changes through the seasons.

The French study adds an important piece to this picture: a vegetable patch can be an entry point to biodiversity, not merely a production zone. Its potential becomes tangible when the garden retains flowers, shelter, living soil and varied vegetation.

Keeping local harvests in use

A wildlife-friendly garden may still produce uneven harvests: a glut of courgettes for two weeks, too many herbs or fruit ripening all at once. Sharing these crops prevents the work of growing them from ending in waste and extends the local role of the garden.

Seeed enables individuals and producers to give, sell or swap harvests and local products with people nearby. That connection does not create biodiversity in a garden. It can simply help a small harvest or temporary surplus find a local use.

The study’s message is encouraging without being magical. Vegetable growing can strengthen contact with nature and coexist with richer flowering plant life, but outcomes depend on everyday choices. The best vegetable garden for biodiversity is not necessarily the wildest or the most productive. It is one that keeps lasting room for several forms of life.

Sources

Image: “Dean Heirloom Garden in bloom”, photograph by the National Park Service (NPS), via Wikimedia Commons, public domain in the United States. Source page and reuse information. Public Domain Mark 1.0.